Heme oxygenase-1 modulates thrombomodulin and activated protein C levels to attenuate lung injury in cecal ligation and puncture-induced acute lung injury mice.

Abstract:

:Acute lung injury (ALI) is often associated with sepsis and is the most common cause of acute respiratory failure. The authors evaluated the role of the heme oxygenase (HO)/carbon monoxide (CO) system on lung injury in a cecal ligation and puncture (CLP)-induced mouse model of ALI. The authors established CLP-induced ALI in C57BL/6 mice. They pretreated CLP-induced mice with HO-1 inducer (hemin) or HO-1 inhibitor (Zn protoporphyrin [Znpp]) and determined various lung injury parameters including partial pressure of arterial oxygen, thrombosis, edema, and plasma malondialdehyde (MDA), and myeloperoxidase (MPO) level. Enzyme-linked immunosorbent assay (ELISA) was performed to measure plasma thrombomodulin (TM) and activated protein C (APC) levels. TM and HO-1 expression in lung tissue was evaluated by immunofluorescence staining and Western blotting. Survival rate was also monitored. CLP-induced ALI was associated with decreased partial pressure of arterial oxygen, and increased thrombosis, edema, and plasma MDA, and MPO level. Plasma TM was significantly up-regulated, whereas cell surface TM in lung tissue was significantly decreased in the CLP group compared to the sham animals. Pretreatment with hemin caused up-regulation of HO-1 expression and improved partial pressure of arterial oxygen. Hemin pretreatment also caused a significant decrease in plasma TM along with increased cell surface TM expression in lung tissue, suggesting attenuation of lung injury. Survival data showed that no difference for survival between CLP animals pretreated with hemin or Znpp. Taken together, HO-1 exerts its protective effects on CLP-induced ALI via regulating cell surface TM and APC expression and modulating blood coagulation.

journal_name

Exp Lung Res

authors

Fei D,Meng X,Kang K,Nan C,Zhao M,Pan S,Gao M,Yang S,Zhao M

doi

10.3109/01902148.2012.660559

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

173-82

issue

4

eissn

0190-2148

issn

1521-0499

journal_volume

38

pub_type

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